This U.S. industry comprises establishments known as "one-hour" photofinishing labs primarily engaged in developing film and/or making photographic slides, prints, and enlargements on a short turnaround or while-you-wait basis. Cross-References. Photofinishing laboratories (except those known as "one-hour" photofinishing labs) are classified in U.S. Industry 812921, Photofinishing Laboratories (except One-Hour).